Coin Flip & Streak Tracker
Flip one coin or thousands, with animated flips, streak records, a live convergence chart and a chi-square fairness test — all powered by crypto.getRandomValues.
Press flip to begin
Convergence to 50%
Running share of heads after each flip. The dashed line is the theoretical 50%.
Heads
0
—
Tails
0
—
Longest heads run
0
now 0
Longest tails run
0
now 0
Fairness (chi-square)
Flip at least two coins to compute the statistic.
Streak challenge
Predict the next three flips.
Pending guesses: —
Score: 0/0
About this tool
Every flip comes from crypto.getRandomValues with rejection sampling, so there is no modulo bias and no seeded pseudo-randomness. Heads and tails totals, current and record streaks and the running heads ratio are all derived from the flip history, and the fairness panel reports the chi-square statistic with its p-value for one degree of freedom. Nothing is transmitted: the tool works entirely in your browser, offline.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Coin Flip & Streak Tracker really free?
Yes. Coin Flip & Streak Tracker is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Coin Flip & Streak Tracker upload my data?
No. Coin Flip & Streak Tracker runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Coin Flip & Streak Tracker is ready to use on desktop or mobile.
Does Coin Flip & Streak Tracker work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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